Biochemistry
Disulfide Bond
Definition
A disulfide bond is a covalent bond formed between the sulfur atoms of two cysteine residues in a peptide or protein. These bonds play a critical role in stabilizing three-dimensional structure and are essential for the biological activity of many peptides. In peptide synthesis and handling, maintaining correct disulfide bond formation is crucial — improper folding can result in inactive or misfolded products. Storage conditions (temperature, absence of reducing agents) help preserve disulfide bond integrity.